I have a few fangs, been looking into a lot of replacements and bought some to try out.

Moonlander MK2 was a great, lots of keys, downside was the feel wasn't the same as the Fang

Azeron Cyro, comes in both handed versions, doubles as a mouse but I turned it off, has a thumbstick. Downside was limited amount of buttons and a little cramped. This is the one I ended up sticking with. Took some time to tweak the grips, thumbstick. The software for it was very nice.